The test surface moves underneath the AA-888 roller contact point. The roller allows for less friction and continuous measurement. Used with foils, sheets of flat material, rolled metal strips etc. An included lock nut will keep this roller aligned.

Directly compatible with the EG-series gages.

4-48 Flat Roller 3/8" dia. wheel x 5/16" dia. body x 5/8" long

If you wish to use a Gage with (M2.5 threads) attaching the 4-48 contact point, you will need to use an AA-848 thread adapter.